THE ART OF THE MATTER: Cynthia Rowley and her husband Bill Powers’ online art venture Exhibition A has teamed up with Refinery29 to offer limited edition tops and T-shirts stamped with the work of such leading contemporary artists as Mark Borthwick, William Eadon, Peter Dayton and Ryan Humphrey. As of Friday, the collection will be available exclusively for two weeks as an online shop-in-shop on Refinery29.com.